A query builder that constructs a phrase query. A phrase query is used to
locate hits with terms within a certain distance from one another. The
distance is also called slop. For example, you can use it to search for
the values: java and london, which are near one another. "Near" is
measured using the slop, and a value of 1 means that they will be in a
distance of 1 other value from one another.